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Kaub, L.* ; Milz, S.* ; Barapatre, N.* ; Büttner, A.* ; Michalke, B. ; Schmitz, C.* ; Gilder, S.A.*

Magnetic iron-oxide nanoparticles in the brain connected to alcohol-associated liver disease.

Sci. Rep. 15:24505 (2025)

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Magnetic iron-oxide nanoparticles in the form of magnetite (Fe₃O₄) are present in the human brain. They have been hypothesized to biomineralize in situ, as a result of dysfunctional iron homeostasis related to Alzheimer's disease, or to enter the brain as airborne pollution particles. Regardless of their origin, magnetic iron-oxides pose a potential hazard to human health due to their high redox activity and surface charge. Here we report measurements on four post-mortem human brainstems, with one brainstem showing approximately 100 times higher magnetite concentrations than the other cases. This brainstem came from a subject with alcohol-associated liver disease (ALD) that manifested in liver cirrhosis and massive hepatic iron overload. Laser ablation - inductively coupled plasma - mass spectrometry showed the highest levels of trace metals (iron, copper and manganese) in the ALD brainstem. It is well established that a dysfunctional liver can result in the accumulation of trace metals in the brain. Our data indicate a similar pathway for magnetite particles, yet liver pathology has not been linked to magnetite occurrence in the brain so far. It may prove to be a crucial factor in understanding the high variation of magnetite concentrations found in human brains.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Alcohol Use Disorder ; Brain Iron ; Brain Magnetite ; Iron Overload ; La-icp-ms

ISSN (print) / ISBN 2045-2322

e-ISSN 2045-2322

Journal Scientific Reports

Quellenangaben Volume: 15, Issue: 1, Article Number: 24505

Publisher Nature Publishing Group

Publishing Place London

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit BioGeoChemistry and Analytics (BGC)